Federal Register #2026-19094

FAA Proposed Airworthiness Directive for Pratt & Whitney Engines: Inspection and Replacement of HPC Components

The Federal Aviation Administration (FAA), part of the Department of Transportation, is proposing new airworthiness directives for Pratt & Whitney Model PW1500G and PW1900G engines equipped with specific high-pressure compressor (HPC) modules. - Government Buyer: - Federal Aviation Administration (FAA) - Aircraft Certification Service - OEM Highlight: - Pratt & Whitney - Products/Services Requested: - Initial and repetitive borescope inspections (BSIs) of HPC 1st, 2nd, and 3rd stage rotor rear rim surfaces - Removal and replacement of affected HPC rotors if wear or damage is found - Replacement of HPC variable stator vane (VSV) bushing set, including sleeve bearings (P/Ns 30G6496, 30G6497, 30G6498) and thrust washer bearings (P/Ns 30G6499, 30G6500, 30G6503) or later approved part numbers - Unique Requirements: - Compliance with Pratt & Whitney Alert Service Bulletins - Use of eligible part numbers for replacement components - Replacement of HPC VSV bushing set is a terminating action for repetitive inspections - No specific purchase quantities; this is a regulatory maintenance directive - Additional Directive (for ATRGIE ATR42 and ATR72 airplanes): - Leakage tests and possible replacement of landing gear selector valves to address uncommanded nose landing gear retraction - The directive aims to prevent unsafe conditions that could lead to engine or aircraft damage and loss of control.

Description

The FAA proposes a new airworthiness directive (AD) for all Pratt & Whitney Model PW1519G, PW1521G, PW1521GA, PW1521G-3, PW1524G, PW1524G-3, PW1525G, PW1525G-3, PW1919G, PW1919G-RC, PW1921G, PW1921G-RC, PW1922G, PW1923G, and PW1923G-A engines with certain high-pressure compressor (HPC) modules installed. This AD is prompted by reports of clashing on the HPC 2nd or 3rd stage rotors caused by contact with HPC variable stator vanes (VSV). It requires initial and repetitive borescope inspections of HPC rotor rear rim surfaces for wear or damage, removal and replacement of affected parts, and replacement of the HPC VSV bushing set as a terminating action to inspections. The AD aims to prevent rotor failure, uncontained part release, engine and airplane damage, and loss of control.

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